[Table/Fig-5]:

Comparison of dimensional accuracy of group I casts (Premolar site) with master model using three types of impression trays.

Group I		Group II	Premolar
			Buczco-lingual		Mesio-distal
			Mean ± SD	Difference	Mean ± SD	Difference
Group I Medium body	IA Metal Dual Arch	Mean ± SD % difference p value	4.148± 0.058 - -	0.055± 0.058 1.3% 0.014, S	3.294± 0.054 - -	-0.027± 0.054 0.8% 0.15, NS
	IB Plastic Dual Arch	Mean ± SD % difference p value	4.146± 0.091 - -	0.058± 0.091 1.4% 0.08, NS	3.161± 0.069 - -	0.106± 0.069 3.3% <0.01, S
	IC Custom Tray	Mean ± SD % difference p value	4.198± 0.009 - -	0.005± 0.009 0.1% 0.11,NS	3.259± 0.026 - -	0.008± 0.026 0.2% 0.38,NS
	ANOVA F P	IA/IB/IC	-	2.28 0.12,NS	-	17.3 <0.01,S
	(Difference In Accuracy Amongst Various Tray Groups)	IA-IB IA-IC IB-IC	- - -	0.99,NS 1.19,NS 0.16,NS	- - -	<0.01,S 0.32,NS <0.01,S

*Anova test